JP3012606B1 - Base station device, mobile station device, mobile communication system using them, and mobile communication method - Google Patents

Abstract

A base station apparatus, a mobile station apparatus, a mobile communication system using the same, and a mobile communication method that can improve communication quality by leveling traffic of a plurality of mobile communication systems. . A base station apparatus 10, 11 ₁ to 11 _3, data representing the traffic detected by the traffic detector is greater than the predetermined value alpha, and traffic data from the other mobile communication system 20 is above a predetermined value β If small,
A system switching request instructing operation under another mobile communication system is transmitted to mobile station devices 30 ₁ and 30 ₂ capable of communicating with a plurality of mobile communication systems. The mobile station devices 30 ₁ and 30 ₂ switch operation modes so as to operate under another mobile communication system in response to a system switching request from the base station device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus, a mobile station apparatus, a mobile communication system using the same, and a mobile communication method. In particular, a mobile station apparatus operable under a plurality of mobile communication systems is optimal. The present invention relates to a technology for switching to operate under a mobile communication system.

[0002]

2. Description of the Related Art Conventionally, various mobile telephone systems such as a PHS (Personal Handyphone System) employing an ultra-small cell system, an automobile telephone system employing a small cell system, and a portable telephone system have been known. These mobile telephone systems each have advantages and disadvantages.

For example, in a PHS, a radio wave reaches a radius of about 100 m from a base station. Therefore, many base stations are densely installed to form a wide service area. As a result, there is a problem that an area where radio waves are difficult to reach occurs depending on the installation state of the base station. On the other hand, this PHS has the advantage that the telephone charge is lower than other mobile telephone systems.

On the other hand, in a portable telephone system, since a small cell system is used which has a relatively large radio wave reach, there is little problem that an area where radio waves are hard to reach occurs. However, this mobile phone system has a problem that the call charge is higher than, for example, PHS.

In order to solve such a conventional problem,
In recent years, a dual-band mobile phone that can be applied to two mobile phone systems such as a PHS and a mobile phone system has been considered. Hereinafter, the case where this dual-band mobile phone operates as a PHS mobile station will be referred to as “PHS”.
The case where the mobile station operates as a mobile station in a mobile phone system is referred to as an “HS mode”.

[0006] Switching of the operation mode in this dual-band mobile phone, that is, switching of the mobile communication system, has been conventionally led by the dual-band mobile phone. That is, the control unit of the dual-band mobile phone operates in the PHS mode when the dual-band mobile phone is within the service area of the PHS and outside the service area of the mobile phone system. When outside and within the service area of the mobile phone system, the operating mode is automatically switched to operate in the mobile phone mode. The control unit of the dual-band mobile phone, when the dual-band mobile phone is in both the service area of the PHS and the mobile phone system,
The operation mode is automatically switched so as to operate in the PHS mode with a low call charge.

[0007] Also, this dual-band mobile phone is:
Independent of such automatic switching, the user can operate a predetermined button to operate in either the PHS mode or the mobile phone mode.

[0008]

Conventionally, as described above, the mobile communication system to which the dual-band mobile phone belongs is selectively switched by the control of the dual-band mobile phone itself. At this time, the traffic of the base station device of each mobile communication system is not considered. Therefore, for example, a situation in which the mobile phone system operates in the PHS mode in which the traffic is small even though the traffic is small or vice versa occurs, and there is a problem that the communication quality is reduced.

[0009] As a technique for improving communication quality,
Japanese Patent Application Laid-Open No. H10-65606 discloses a "digital radio communication system and digital radio communication device". The invention disclosed in this publication discloses a base station A1
And a terminal station A2 to C2 for performing wireless communication between the base station and the terminal station and between the base stations, wherein the base station is capable of reducing noise around the base station. A combination of a frequency and a convolutional code that minimizes a transmission error is selected, and communication is performed using the selected combination of the frequency and the convolutional code.

As a result, an error correction code used for communication is appropriately selected according to the surrounding radio wave environment in which communication is performed. As a result, the transmission path error is reduced, so that the deterioration of the communication quality due to the transmission path error can be suppressed. However, this digital wireless communication system cannot prevent a decrease in communication quality due to a large traffic.

The present invention has been made in order to solve such a conventional problem. A base station apparatus capable of improving communication quality by leveling traffic of a plurality of mobile communication systems. It is an object to provide a mobile station device, a mobile communication system using the same, and a mobile communication method.

[0012]

In order to achieve the above object, a base station apparatus according to a first aspect of the present invention comprises a base station of a first mobile communication system comprising a mobile station apparatus and a base station apparatus. A traffic detector for detecting traffic, a traffic receiver for receiving traffic data representing traffic of the second mobile communication system, and a data representing traffic detected by the traffic detector being a predetermined value. When the traffic data received by the traffic receiver is larger than α and smaller than a predetermined value β, a system switching request for instructing to operate under the second mobile communication system is issued to the second mobile communication system. A base station control unit for transmitting to the mobile station device of the mobile communication system.

[0013] In this specification, the term "base station apparatus" is a concept including a plurality of base stations and an exchange controlling them. Therefore, a base station connected to an exchange and transmitting and receiving radio waves based on a signal from the exchange is simply referred to as a “base station”. The traffic detector, the traffic receiver, and the base station controller can be provided inside the exchange.

According to the base station apparatus of the first aspect of the present invention, when the traffic of the first mobile communication system is large and the traffic of the second mobile communication system is small, the first mobile communication system By transmitting a system switching request to a mobile station device belonging to a communication system, the mobile station device can be operated under the second mobile communication system, so that traffic of each mobile communication system can be leveled. As a result, communication quality can be improved.

[0015] The traffic receiving section of the base station apparatus may be configured to receive the traffic data from the base station apparatus of the second mobile communication system.

In this case, an exchange included in the base station device of the first mobile communication system and an exchange included in the base station device of the second mobile communication system are connected by a cable,
It can be configured to send and receive traffic data between them. Instead of connecting them with a cable, they may be connected by a wireless line to transmit and receive traffic data.

Further, a mobile station apparatus according to a second aspect of the present invention has a first mobile station apparatus and a base station apparatus capable of communicating with a plurality of mobile communication systems for the same purpose as described above. The mobile station device of a communication system, comprising: a switching request receiving unit that receives a system switching request from a base station device; and a second mobile communication system that responds to a system switching request received by the switching request receiving unit. A mobile station control unit that switches an operation mode so as to operate below.

According to the mobile station apparatus according to the second aspect of the present invention, the mobile communication system to which the mobile station apparatus belongs is switched according to the system switching request from the base station apparatus. Together with the base station apparatus according to the aspect, it is possible to equalize the traffic of each mobile communication system, and as a result, it is possible to improve communication quality.

A mobile communication system according to a third aspect of the present invention has a mobile station device and a base station device capable of communicating with a plurality of mobile communication systems for the same purpose as described above.
The base station apparatus includes a traffic detection unit that detects traffic, a traffic reception unit that receives traffic data representing traffic of another mobile communication system, and a data representing traffic detected by the traffic detection unit. When the traffic data is larger and the traffic data received by the traffic receiving unit is smaller than a predetermined value β, the mobile station apparatus sends a system switching request for instructing operation under the other mobile communication system. A base station control unit for transmitting to the mobile station device, a switching request receiving unit for receiving a system switching request from the base station device, and another in response to a system switching request received by the switching request receiving unit. A mobile station control unit that switches an operation mode so as to operate under the mobile communication system.

[0020] The traffic receiving unit in the base station device constituting the mobile communication system may be configured to receive the traffic data from the base station device of the another mobile communication system.

Further, in the mobile communication method according to the fourth aspect of the present invention, a mobile communication method performed between a mobile station device and a base station device capable of communicating with a plurality of mobile communication systems for the same purpose as described above. The communication method, wherein the base station device detects traffic, receives traffic data representing traffic of another mobile communication system, the data representing the detected traffic is larger than a predetermined value α, and the traffic When the traffic data received by the receiving unit is smaller than a predetermined value β, a system switching request for instructing that the mobile station apparatus should operate under the other mobile communication system is transmitted to the mobile station apparatus. The station equipment is
Receiving a system switching request from the base station apparatus, switching an operation mode to operate under the other mobile communication system according to the received system switching request,
It is configured as follows.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following, for simplicity of description, two systems such as A system and B system
A case will be described where the types of mobile communication systems are arranged to have overlapping service areas,
The mobile communication system to which the present invention is applied may be three or more types.

The A system and the B system include, for example, an automobile telephone system, a portable telephone system, a PHS, a cordless telephone system, a train / ship /
Airline telephone systems, satellite mobile communication systems, and various other mobile communication systems can be used.

FIG. 1 is a diagram showing a configuration of a mobile communication system according to an embodiment of the present invention. The A system includes an exchange 10, base stations 11 _{1 to} 11 ₃ , wireless communication devices 13 ₁ and 1
And a 3 _2. Exchange 10 and base station 11 _1-
11 ₃ corresponding to a base station apparatus of the present invention.

The exchange 10 controls the entire A system. The switch 10, the base station 11 ₁ to 11 ₃ are connected by a cable. Base station 11 ₁ to 11 ₃ each transmit and receive radio waves between the wireless communication device existing within a zone 12 ₁ to 12 ₃ in a predetermined range, thereby the wireless communication is performed. Radios 13 ₁ and 13 ₂ is a wireless communication device capable of transmitting and receiving radio waves only between the base station 11 ₁ to 11 ₃ of the A system.

The B system includes the exchange 20 and the base station 21 ₁
To 21 _3, and a wireless communication device 23 ₁ and 23 _2. Switch 20 and base station 21 ₁ to 21 ₃ corresponding to a base station apparatus of the present invention.

The exchange 20 controls the entire B system. The switch 20, the base station 21 ₁ to 21 ₃ are connected by a cable. Base station 21 ₁ to 21 ₃ each transmit and receive radio waves between the wireless communication device existing within a zone 22 _{1-22 3} in a predetermined range, thereby the wireless communication is performed. Radios 23 ₁ and 23 ₂ is a wireless communication device capable of transmitting and receiving radio waves only between the base station 21 ₁ to 21 ₃ of the B system.

The dual band wireless communication devices 30 ₁ and 32 ₂
Corresponds to the mobile station device of the present invention. The dual band wireless communication devices 30 ₁ and 32 ₂ are connected to the base station 11 of the A system.
Can perform wireless communication with the ₁ to 11 ₃ and the base station 21 ₁ to 21 ₃ of the B system. Which system is used for wireless communication will be described later in detail.
Is determined by

The exchange 10 and the exchange 20 are connected by an information exchange line 40 composed of, for example, a cable. On the information exchange line 40, data representing the current traffic of the A system and the B system (referred to as “traffic data”) is transmitted and received. The exchange 10 and the exchange 20 may be configured to be connected by a wireless line instead of the information exchange line 40.

Next, the configuration of the exchanges 10 and 20 will be described with reference to the block diagram shown in FIG.

The exchange 10 of the A system includes a control unit 10
0, a traffic detection unit 101 and a transmission / reception unit 102. The control unit 100 corresponds to the base station control unit of the present invention. The control unit 100 can be constituted by, for example, a computer for controlling the entire exchange 10 and thus the entire A system.

The control unit 100 includes a base station 11₁~ 1
1_ThreeAnd a communication network are connected. The control unit 100
Line communication device 13₁And 13_TwoAnd dual-band wireless communication
Machine 30 ₁And 30_TwoBase station 11 that has received radio waves from₁~
11_ThreeOut to the communication network. Ma
In addition, a signal from the communication network is transmitted to the base station 11.₁~ 11_ThreeThrough nothing
Line communication device 13₁And 13_TwoAnd dual-band wireless communication
Machine 30₁And 30_TwoTo send to. This allows the user to
It is possible to communicate with the desired partner using the A system.
I am able to do it.

The traffic detection unit 101 controls
Base station 11 under control of unit 100 ₁~ 11_ThreeCurrent
Detect traffic. The current trough detected here
Traffic data representing traffic, for example,
Of the current number of calls to the maximum number of calls that the system can handle
(%). This traffic data
When the rate is 100% or more, incoming and outgoing calls must be kept waiting
become. The traffic detected by the traffic detection unit 101
The traffic data is transmitted to and received from the transmission / reception unit 1 via the control unit 100.
02.

The transmitting / receiving section 102 corresponds to the traffic transmitting / receiving section of the present invention. The transmission / reception unit 102 includes the control unit 10
It modulates the traffic data sent from 0 and outputs it to the information exchange line 40. The control unit 100 also demodulates traffic data sent from the information exchange line 40 and
To supply.

The switching unit 20 of the B system includes a control unit 20
0, a traffic detection unit 201 and a transmission / reception unit 202. Control unit 200 corresponds to the base station control unit of the present invention. The control unit 200 can be constituted by, for example, a computer for controlling the entire exchange 20 and thus the entire B system.

The control unit 200 includes the base station 21₁~ 2
1_ThreeAnd a communication network are connected. The control unit 200
Line communication device 23₁And 23_TwoAnd dual-band wireless communication
Machine 30 ₁And 30_TwoBase station 21 that has received radio waves from₁~
21_ThreeOut to the communication network. Ma
In addition, a signal from the communication network is transmitted to the base station 21.₁~ 21_ThreeThrough nothing
Line communication device 23₁And 23_TwoAnd dual-band wireless communication
Machine 30₁And 30_TwoTo send to. This allows the user to
It is possible to communicate with the desired partner using the B system.
I am able to do it.

The traffic detection unit 201 controls
Base station 21 under control of unit 200 ₁~ 21_ThreeCurrent
Detect traffic. The current trough detected here
Traffic data representing traffic
For example, the current number of calls
It can be represented by the ratio (%) of the number of calls. This traffic
Traffic data detected by the
It is supplied to the transmission / reception unit 202 via the control unit 200.

The transmission / reception section 202 corresponds to the traffic transmission / reception section of the present invention. The transmission / reception unit 202 includes the control unit 20
It modulates the traffic data sent from 0 and outputs it to the information exchange line 40. The control unit 200 also demodulates traffic data sent from the information exchange line 40 and
To supply.

Next, it will be described with reference to the block diagram showing the configuration of a dual-band wireless communications device 30 ₁ and 30 ₂ in FIG. This dual-band wireless communication device includes a common antenna 300, a wireless unit 301, a control unit 302, a receiver 3
03, a transmitter 304 and an operation unit 305.

The common antenna 300 converts a received radio wave into an electric signal and supplies the electric signal to the radio unit 301. In addition, it converts a signal sent from the wireless unit 301 into a radio wave and emits it into the air. The switching request receiving unit according to the present invention includes the common antenna 300 and the radio unit 301.

The radio unit 301 is a radio unit 30 for the A system.
1A and a B system radio section 301B. The A-system radio section 301A and the B-system radio section 301B demodulate the signal components extracted from the radio frequency band signals transmitted from the common antenna 300, respectively. The audio data and control data obtained by the demodulation are supplied to the control unit 302. The control data includes data representing a “system switching request” described later.

The A-system radio section 301A and the B-system radio section 301B modulate the voice data and control data transmitted from the control section 302 to modulate the common antenna 3A.
Supply to 00. The modulated control data includes a signal indicating “system switching confirmation” described later. Which of the A-system radio section 301A and the B-system radio section 301B is used for the above-mentioned modulation / demodulation is determined according to the system selected in the system switching process described later.

The control section 302 corresponds to the mobile station control section of the present invention. The control unit 302 controls the entire dual band wireless communication device. For example, system switching control (details will be described later) for switching between operating the dual band wireless communication device under the A system or operating under the B system is performed. In addition, voice is generated by supplying voice data obtained from the wireless unit 301 to the receiver 303. Also, the audio data from the transmitter 304 is supplied to the wireless unit 301. Further, the operation unit 305 is controlled.

The operation unit 305 includes a switch and a display device (not shown). The switch is used, for example, for inputting a telephone number, setting various modes, registering various data, and the like. In addition, the display device displays messages such as date, time, registered data, radio wave state, and the like in characters and pictures. Data input using the switches of the operation unit 305 is supplied to the control unit 302. The display unit of the operation unit 305 includes a control unit 30.
2, display data is supplied.

Next, a system switching process in the mobile communication system configured as described above will be described with reference to the flowcharts of FIGS.

[0046] In the following, the dual-band wireless communications device 30 ₁ is assumed to be set to operate under the A system. In addition, the dual band wireless communication device 3
0 _1, when starting communication, A system and B communicate with both the system that can be, and notifies the exchange 10 via the base station 11 _2, information exchange representing the fact It is assumed that the information is stored in ten storage devices (not shown).

FIG. 4 is a flowchart showing a system switching process performed by the control unit 100 of the exchange 10 of the A system. This system switching processing routine is executed by the exchange 1
It is called at regular intervals from the main processing routine for controlling the entirety of zero. Therefore, this system switching process is executed at a constant cycle.

In this system switching process, first, it is checked whether or not the traffic of the system A is heavy (step S10). This is the traffic detector 10
This is performed by checking whether the traffic data detected in step 1 is larger than a predetermined value α. Here, as the predetermined value α, an arbitrary value can be used in consideration of the outgoing and incoming call waiting times that can be permitted in the A system. By the processing in step S10, the exchange 1 of the system A
0 implements a function of constantly monitoring the traffic of the A system.

If it is determined in step S10 that the traffic of the system A is not large, it is recognized that the load on the exchange 10 is light, and the system switching processing ends without performing the system switching. In this case, the dual band radio will continue to operate under the A system.

On the other hand, if it is determined in step S10 that the traffic of the system A is heavy, it is recognized that the load of the exchange 10 is heavy, and then it is checked whether the traffic of the system B is heavy. (Step S11). This is the information exchange line 40 from the B system.
This is performed by checking whether or not the traffic data transmitted to the transmission / reception unit 102 via the server is larger than a predetermined value β.

Here, as the predetermined value β, an arbitrary value can be used in consideration of the outgoing and incoming call waiting times that can be permitted in the B system. By the processing in step S11, the function of monitoring the traffic of the B system when the traffic of the A system is large is realized in the exchange 10 of the A system.

If it is determined in step S11 that the traffic of the system B is heavy, it is recognized that the loads on the exchanges 10 and 20 are both heavy, and the system switching processing is performed without system switching. finish. In this case, the dual-band wireless communication device continues to operate under the A system.

On the other hand, if it is determined in step S11 that the traffic of the B system is not large, it is recognized that the load on the exchange 20 is light. It is checked whether a wireless communication device exists (step S1).
2). This is performed by referring to information stored in the storage device of the exchange 10 at the start of communication, which indicates whether communication with both the A system and the B system is possible.

If it is determined in step S12 that there is no dual-band wireless communication device that can communicate with the B system, the system switching process ends without performing system switching. On the other hand, when it is determined that communicatable dual-band radios with B system exists, then, to dual-band wireless communications device 30 ₁ can communicate with the B system, a signal representative of the "System switching request" Is transmitted (step S13). This is done by the control unit 100 of the A system to create a data representing a system switch request, to the dual-band wireless communications device 30 ₁ via the base station 11 _2. Note that the exchange 10 of the A system is a dual-band wireless communication device 30.
It keeps track _{that 1} is present in the base station 21 within the _second zone.

Next, the dual band wireless communication device 30 ₁
It is checked whether a signal indicating "system switching confirmation" has been received (step S14). Here, when it is determined that the signal indicating the system switching confirmation has not been received, the process stands by while repeatedly executing step S14 until the signal is received. In the course of this repetition,
When it is determined that the signal indicating the confirmation of the system switching has been received, the system switching process ends. Thereafter, the dual-band wireless communications device 30 ₁ will operate under the B system.

The system switching processing performed in the system A has been described above.
The system switching process performed at 0 is the same as above.

Next, a system switching process performed by the control unit 302 of the dual band wireless communication device will be described with reference to a flowchart shown in FIG. This system switching processing routine is called at regular intervals from a main processing routine for controlling the entire dual band wireless communication device. Therefore, this system switching process is executed at a constant cycle.

In this system switching process, first, it is checked whether a signal indicating "system switching request" has been received (step S20). This is the common antenna 300
This is performed by checking whether or not the data obtained by demodulating the radio wave received by the wireless unit 301 includes control data indicating a system switching request. Since this system switching processing routine is executed at a constant cycle, the dual-band wireless communication device always monitors whether or not a "system switching request" has been received.

If it is determined in step S20 that the "system switching request" has not been received, the system switching process ends without performing the system switching. On the other hand, when it is determined that the “system switching request” has been received, it is then checked whether or not the dual-band wireless communication device is currently in a state where the system can be switched (step S21). For example, it is checked whether communication is currently being performed. Here, if it is determined that the system cannot be switched, the system switching process ends without performing the system switching.

On the other hand, if it is determined in step S21 that the system can be switched, a signal indicating "system switching confirmation" is transmitted to the base station of system A (step S22). ). That is, the control unit 302 generates data indicating a system switching confirmation and supplies the data to the wireless unit 301. Radio section 301 modulates the data indicating the system switching confirmation and supplies the data to common antenna 300. As a result, data indicating system switching confirmation is emitted as radio waves from the common antenna 300 and transmitted to the base station.

Next, communication is started in the system B (step S23). That is, the B-system radio unit 301B is activated, and the A-system radio unit 301A is deactivated. As a result, communication with the base station that transmits and receives the radio waves of the A system is disconnected, and communication using the radio waves of the B system and the base station that transmits and receives the radio waves of the B system is started.

According to the mobile communication system according to the embodiment of the present invention described above, when the load on one mobile communication system increases, the dual-band radio communication device communicates with the other mobile communication system. Are switched by the control signal from the base station. As a result, traffic of the mobile communication system having a large load is reduced, and traffic of a plurality of mobile communication systems is leveled. As a result, it is possible to prevent a decrease in communication quality due to heavy traffic.

In addition, since the base station switches the mobile communication system under the initiative, the mobile communication system can be switched by taking the traffic of the mobile communication system into consideration by the dual-band radio communication apparatus. Get higher.

[0064]

As described in detail above, according to the present invention,
A base station device, a mobile station device, and a mobile communication system using the same, which can improve communication quality by leveling traffic of a plurality of mobile communication systems,
In addition, a mobile communication method can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an exchange used in the mobile communication system according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a dual band wireless communication device as a mobile station used in the mobile communication system according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a system switching process in the exchange shown in FIG. 2;

FIG. 5 is a flowchart showing a system switching process in the dual band wireless communication device shown in FIG.

[Explanation of symbols]

10 A system of the exchange 11 ₁ to 11 ₃ A system base station 12 ₁ to 12 ₃ A system of zones 13 _1, 13 ₂ A system of wireless communication equipment 20 B system of the exchange 21 ₁ through 21 ₃ B a base station system 22 _{1-22 3} zones 23 ₁ B system, 23 ₂ B radio communication device 30 _first system, 30 ₂ dual-band wireless communication device 40 exchange information lines 100, 200 control unit 101 and 201 the traffic detecting unit 102 202 transceiver 300 Common antenna 301 Radio section 301A Radio section for A system 301B Radio section for B system 302 Control section 303 Receiver 304 Transmitter 305 Operation section

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI H04Q 7/26 7/30 (58) Investigated field (Int.Cl. ⁷ , DB name) H04B 7/26 H04Q ⁷ /04- 7/38 H04M 3/00 H04M 3/36

Claims (6)

(57) [Claims] A mobile station device , a base station, and a control unit for controlling the base station.
Exchange in a mobile communication system comprising an exchange for
A 換機, and traffic detector for detecting a traffic, and traffic receiver to receive traffic data representing a traffic other mobile communication systems, data representing the detected traffic detector traffic predetermined value α The traffic data received by the traffic receiver is larger than a predetermined value β
If smaller, the system switch request for instructing to operate under the other mobile communication systems
The base station controller instructing the base station to transmit to the mobile station apparatus, exchange with and. Wherein said traffic receiver, exchanger according to claim 1 for receiving the traffic data from the exchange of the other mobile communication systems. 3. A mobile station apparatus capable of communicating with a plurality of mobile communication systems , a base station, and an exchange for controlling the base station.
The mobile station device in the mobile communication system, and instructs to operate under another mobile communication system.
A request for system switching, in response to an instruction from the exchange.
A switching request receiving unit for receiving a system switching request transmitted by the base station, and responding to the system switching request received by the switching request receiving unit.
A mobile station control unit that switches an operation mode so as to operate under the other mobile communication system. 4. A mobile station device capable of communicating with a plurality of mobile communication systems , a base station, and an exchange for controlling the base station , wherein the exchange is a traffic detection unit for detecting traffic. A traffic receiving unit that receives traffic data representing traffic of another mobile communication system; and the data representing traffic detected by the traffic detecting unit is larger than a predetermined value α, and the traffic receiving unit receives the traffic data. Traffic data is at a given value β
A base station control unit that instructs the base station to transmit a system switching request to the mobile station apparatus to instruct that the mobile station apparatus operate under the other mobile communication system. The mobile station device transmits the signal before the base station transmits the signal in response to an instruction from the exchange.
A switching request receiving unit for receiving the system switching request, and responding to the system switching request received by the switching request receiving unit
A mobile station control unit that switches an operation mode to operate under the other mobile communication system. 5. The mobile communication system according to claim 4, wherein said traffic receiving unit receives said traffic data from an exchange of said another mobile communication system. 6. A mobile communication system capable of communicating with a plurality of mobile communication systems.
Station device, Base station and exchange for controlling the base station
In a mobile communication system havingMobile communication method
And saidswitchDetects traffic and represents traffic that represents traffic from other mobile communication systems.
Received traffic data, and the data representing the detected traffic is a predetermined value α.
Bigger and frontRecordingBelieveTatoWhere the traffic data
If the value is smaller than the fixed value β, the other mobile communication system
System switch request to indicate what should be done under
To the mobile station deviceInstruct the base station to
And the mobile station device comprises:Before transmission by the base station in response to instructions from the exchange
Record Receiving a system switching request, and responding to the received system switching request,
The operating mode to operate under the communication system
Mobile communication method.